Secure Disciplined Cloud Modernization for State Government Communications

The challenge

The state government's central IT agency is responsible for delivering reliable, secure communications services to thousands of employees across agencies and locations statewide. For more than 15 years, the state relied on an on‑premises Cisco Unified Communications Manager (CUCM) environment that had proven dependable but was becoming increasingly costly and operationally complex to sustain.

As the infrastructure aged, the state reached a critical decision point common to public‑sector IT leaders: continue investing in on‑premises infrastructure with rising maintenance and lifecycle risk, or modernize to a cloud‑delivered model without disrupting essential services. Any change would need to preserve existing user workflows, support a large estate of physical phones, and meet the state's security and compliance requirements.

Webex Calling Dedicated Instance presented a viable modernization path, offering a dedicated, single‑tenant cloud architecture while maintaining a familiar CUCM‑based user experience. However, executing the migration carried significant risk, including:

• Service continuity risk: Thousands of physical phones and shared lines across locations required a proven, low‑risk migration approach with validated back‑out procedures.
• Operational complexity: Shared lines and interdependent configurations made selective migrations difficult without affecting other users.
• Governance and timing challenges: State budget cycles introduced gaps in engagement, requiring the project to regain momentum while maintaining readiness.
• Network and integration constraints: A split‑view DNS architecture complicated integrations with external services reliant on internal DNS.
• Security and messaging requirements: Employee notifications required a non‑standard integration with the state's email security and filtering platform.

To move forward, the state needed a migration strategy that balanced modernization with discipline—minimizing operational risk while delivering long‑term sustainability.

The solution

To address the state's modernization goals while minimizing operational risk, WWT delivered a disciplined, end‑to‑end migration strategy designed to preserve service continuity and maintain full governance throughout execution.

WWT's professional services team launched a dedicated project structure with weekly governance reviews, ensuring transparency, executive visibility and clear decision‑making at every phase. A comprehensive Method of Procedure (MOP) was developed, formally reviewed and approved by agency leadership before any production activity began—establishing a clear, auditable framework for execution and back‑out if needed.

To eliminate uncertainty before migrating users at scale, WWT conducted a proof‑of‑concept migration of the central CUCM cluster. This phase included full back‑out testing and validated the migration approach before proceeding at scale. WWT engineers worked with the state IT staff to resolve foundational connectivity, configuration and integration issues within the Webex Calling Dedicated Instance environment. By addressing these risks early, the platform was fully prepared to receive production users without introducing new variables during cutover.

Then WWT executed a phased migration approach governed by formal change control. Voicemail migration was scoped selectively to reduce user impact, and each migration phase followed a defined approval and validation process. Throughout the engagement, WWT worked closely with the state's IT team to maintain readiness despite budget‑cycle interruptions and to re‑establish momentum as the project progressed.

By the time the final cutover window was scheduled, all technical issues had been resolved, and contingency plans were in place for remaining edge cases. The full cutover was executed during an early Saturday morning window, enabling a seamless transition with no disruption to state operations during business hours.

The results

The state government agency completed its migration from on‑premises Cisco Unified Communications Manager to Webex Calling Dedicated Instance through a disciplined, low‑risk execution that preserved service continuity statewide.

The full cutover was delivered on schedule and within the scoped budget, with no disruption to business-hour operations. By executing the migration during a controlled Saturday window, the state transitioned to its new platform without impacting employees or day‑to‑day agency functions.

As a result of the migration, the state:

• Eliminated reliance on on‑premises CUCM infrastructure, reducing ongoing hardware maintenance and operational complexity for the IT team.
• Adopted a secure, dedicated‑tenant cloud calling platform that meets the state's user experience, security and compliance requirements while preserving familiar calling workflows.
• Completed the migration in under six months, from project kickoff to production go‑live.
• Reduced risk with consistent governance and transparent status reporting throughout the engagement.
• Removed tech debt. Resolved long‑standing technical and integration challenges that had previously delayed cloud readiness, enabling a sustainable path forward for communications modernization.
• Captured formal lessons learned following go‑live, strengthening internal readiness and creating a repeatable framework for future modernization initiatives.

With its communications platform successfully modernized, the state is now positioned to reduce operational risk, simplify lifecycle management and support future cloud‑based initiatives with greater confidence.